/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * http://www.gnu.org/copyleft/gpl.html
 */
package com.l2dot.gameserver.model;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.l2dot.Config;
import com.l2dot.L2DatabaseFactory;
import com.l2dot.gameserver.GameTimeController;
import com.l2dot.gameserver.datatables.ItemTable;
import com.l2dot.gameserver.model.L2ItemInstance.ItemLocation;
import com.l2dot.gameserver.model.actor.instance.L2PcInstance;
import com.l2dot.gameserver.templates.L2Item;



import javolution.util.FastList;

/**
 * @author Advi
 *
 */
public abstract class ItemContainer
{
	protected static final Logger _log = Logger.getLogger(ItemContainer.class.getName());

	protected final List<L2ItemInstance> _items;

	protected ItemContainer()
	{
		_items = new FastList<L2ItemInstance>();
	}

	protected abstract L2Character getOwner();
	protected abstract ItemLocation getBaseLocation();

	/**
	 * Returns the ownerID of the inventory
	 * @return int
	 */
	public int getOwnerId(){return getOwner() == null ? 0 : getOwner().getObjectId();}

	/**
	 * Returns the quantity of items in the inventory
	 * @return int
	 */
	public int getSize() {return _items.size();}

	/**
	 * Returns the list of items in inventory
	 * @return L2ItemInstance : items in inventory
	 */
	public L2ItemInstance[] getItems(){return _items.toArray(new L2ItemInstance[_items.size()]);}

	/**
	 * Returns the item from inventory by using its <B>itemId</B><BR><BR>
     *
	 * @param itemId : int designating the ID of the item
	 * @return L2ItemInstance designating the item or null if not found in inventory
	 */
	public L2ItemInstance getItemByItemId(int itemId)
	{
	    for (L2ItemInstance item : _items)
	        if (item != null && item.getItemId() == itemId) return item;

	    return null;
	}

    /**
     * Returns the item from inventory by using its <B>itemId</B><BR><BR>
     *
     * @param itemId : int designating the ID of the item
     * @param itemToIgnore : used during a loop, to avoid returning the same item
     * @return L2ItemInstance designating the item or null if not found in inventory
     */
    public L2ItemInstance getItemByItemId(int itemId, L2ItemInstance itemToIgnore)
    {
        for (L2ItemInstance item : _items)
                if (item != null && item.getItemId() == itemId &&
                        !item.equals(itemToIgnore))
                    return item;

        return null;
    }

	/**
	 * Returns item from inventory by using its <B>objectId</B>
	 * @param objectId : int designating the ID of the object
	 * @return L2ItemInstance designating the item or null if not found in inventory
	 */
	public L2ItemInstance getItemByObjectId(int objectId)
	{
	    for (L2ItemInstance item : _items)
	        if (item.getObjectId() == objectId) return item;

	    return null;
	}

    /**
     * Gets count of item in the inventory
	 * @param itemId : Item to look for
     * @param enchantLevel : enchant level to match on, or -1 for ANY enchant level
     * @return int corresponding to the number of items matching the above conditions.
     */
    public int getInventoryItemCount(int itemId, int enchantLevel)
    {
        int count = 0;

        for (L2ItemInstance item : _items)
            if (item.getItemId() == itemId && ((item.getEnchantLevel() == enchantLevel) || (enchantLevel<0)))
                //if (item.isAvailable((L2PcInstance)getOwner(), true) || item.getItem().getType2() == 3)//available or quest item
                if (item.isStackable())
                    count = item.getCount();
                else
                    count++;

        return count;
    }

    /**
     * Adds item to inventory
	 * @param process : String Identifier of process triggering this action
     * @param item : L2ItemInstance to be added
	 * @param actor : L2PcInstance Player requesting the item add
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the new item or the updated item in inventory
     */
    public L2ItemInstance addItem(String process, L2ItemInstance item, L2PcInstance actor, L2Object reference)
    {
		L2ItemInstance olditem = getItemByItemId(item.getItemId());

		// If stackable item is found in inventory just add to current quantity
		if (olditem != null && olditem.isStackable())
		{
			int count = item.getCount();
			olditem.changeCount(process, count, actor, reference);
			olditem.setLastChange(L2ItemInstance.MODIFIED);

			// And destroys the item
			ItemTable.getInstance().destroyItem(process, item, actor, reference);
			item.updateDatabase();
			item = olditem;

			// Updates database
			if (item.getItemId() == 57 && count < 10000*Config.RATE_DROP_ADENA)
			{
				// Small adena changes won't be saved to database all the time
				if (GameTimeController.getGameTicks() % 5 == 0)
					item.updateDatabase();
			}
			else
				item.updateDatabase();
		}
		// If item hasn't be found in inventory, create new one
		else
		{
			item.setOwnerId(process, getOwnerId(), actor, reference);
			item.setLocation(getBaseLocation());
			item.setLastChange((L2ItemInstance.ADDED));

			// Add item in inventory
			addItem(item);

			// Updates database
			item.updateDatabase();
		}

		refreshWeight();
		return item;
	}

    /**
     * Adds item to inventory
	 * @param process : String Identifier of process triggering this action
     * @param itemId : int Item Identifier of the item to be added
     * @param count : int Quantity of items to be added
	 * @param actor : L2PcInstance Player requesting the item add
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the new item or the updated item in inventory
     */
    public L2ItemInstance addItem(String process, int itemId, int count, L2PcInstance actor, L2Object reference)
    {
		L2ItemInstance item = getItemByItemId(itemId);

		// If stackable item is found in inventory just add to current quantity
		if (item != null && item.isStackable())
		{
			item.changeCount(process, count, actor, reference);
			item.setLastChange(L2ItemInstance.MODIFIED);
			// Updates database
			if (itemId == 57 && count < 10000*Config.RATE_DROP_ADENA)
			{
				// Small adena changes won't be saved to database all the time
				if (GameTimeController.getGameTicks() % 5 == 0)
					item.updateDatabase();
			}
			else
				item.updateDatabase();
		}
		// If item hasn't be found in inventory, create new one
		else
		{
			for (int i = 0; i < count; i++)
			{
				L2Item template = ItemTable.getInstance().getTemplate(itemId);
				if (template == null)
				{
					_log.log(Level.WARNING, (actor != null ? "[" + actor.getName() + "] ": "") +  "Invalid ItemId requested: ", itemId);
					return null;
				}

                item = ItemTable.getInstance().createItem(process, itemId, template.isStackable() ? count : 1, actor, reference);
				item.setOwnerId(getOwnerId());
				item.setLocation(getBaseLocation());
				item.setLastChange(L2ItemInstance.ADDED);

				// Add item in inventory
				addItem(item);
				// Updates database
				item.updateDatabase();

                // If stackable, end loop as entire count is included in 1 instance of item
                if (template.isStackable() || !Config.MULTIPLE_ITEM_DROP) break;
			}
		}

		refreshWeight();
		return item;
	}

    /**
     * Adds Wear/Try On item to inventory<BR><BR>
     *
	 * @param process : String Identifier of process triggering this action
     * @param itemId : int Item Identifier of the item to be added
	 * @param actor : L2PcInstance Player requesting the item add
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the new weared item
     */
    public L2ItemInstance addWearItem(String process, int itemId, L2PcInstance actor, L2Object reference)
    {
        // Surch the item in the inventory of the player
		L2ItemInstance item = getItemByItemId(itemId);

		// There is such item already in inventory
		if (item != null) return item;

        // Create and Init the L2ItemInstance corresponding to the Item Identifier and quantity
        // Add the L2ItemInstance object to _allObjects of L2world
		item = ItemTable.getInstance().createItem(process, itemId, 1, actor, reference);

        // Set Item Properties
		item.setWear(true); // "Try On" Item -> Don't save it in database
		item.setOwnerId(getOwnerId());
		item.setLocation(getBaseLocation());
		item.setLastChange((L2ItemInstance.ADDED));

		// Add item in inventory and equip it if necessary (item location defined)
		addItem(item);

        // Calculate the weight loaded by player
		refreshWeight();

		return item;
	}

    /**
     * Transfers item to another inventory
	 * @param process : String Identifier of process triggering this action
     * @param itemId : int Item Identifier of the item to be transfered
     * @param count : int Quantity of items to be transfered
	 * @param actor : L2PcInstance Player requesting the item transfer
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the new item or the updated item in inventory
     */
    public L2ItemInstance transferItem(String process, int objectId, int count, ItemContainer target, L2PcInstance actor, L2Object reference)
    {
        if (target == null)
        {
        	return null;
        }

    	L2ItemInstance sourceitem = getItemByObjectId(objectId);
    	if (sourceitem == null)
    	{
    		return null;
    	}
        L2ItemInstance targetitem = sourceitem.isStackable() ? target.getItemByItemId(sourceitem.getItemId()) : null;

        synchronized(sourceitem)
        {
        	// check if this item still present in this container
        	if (getItemByObjectId(objectId) != sourceitem)
        	{
        		return null;
        	}

        	// Check if requested quantity is available
        	if (count > sourceitem.getCount()) count = sourceitem.getCount();

        	// If possible, move entire item object
        	if (sourceitem.getCount() == count && targetitem == null)
        	{
        		removeItem(sourceitem);
    			target.addItem(process, sourceitem, actor, reference);
    			targetitem = sourceitem;
        	}
        	else
        	{
        		if (sourceitem.getCount() > count) // If possible, only update counts
        		{
        			sourceitem.changeCount(process, -count, actor, reference);
        		}
        		else // Otherwise destroy old item
        		{
            		removeItem(sourceitem);
                    ItemTable.getInstance().destroyItem(process, sourceitem, actor, reference);
        		}

        		if (targetitem != null) // If possible, only update counts
        		{
        			targetitem.changeCount(process, count, actor, reference);
        		}
        		else // Otherwise add new item
        		{
        			targetitem = target.addItem(process, sourceitem.getItemId(), count, actor, reference);
        		}
        	}

    		// Updates database
    		sourceitem.updateDatabase();
    		if (targetitem != sourceitem && targetitem != null) targetitem.updateDatabase();
    		if (sourceitem.isAugmented())
    			sourceitem.getAugmentation().removeBoni(actor);
    		refreshWeight();
        }
		return targetitem;
	}

	/**
	 * Destroy item from inventory and updates database
	 * @param process : String Identifier of process triggering this action
     * @param item : L2ItemInstance to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItem(String process, L2ItemInstance item, L2PcInstance actor, L2Object reference)
	{
        synchronized(item)
        {
        	// check if item is present in this container
        	if (!_items.contains(item))
        	{
        		return null;
        	}

    		removeItem(item);
            ItemTable.getInstance().destroyItem(process, item, actor, reference);

    		item.updateDatabase();
    		refreshWeight();
        }
		return item;
	}

	/**
	 * Destroy item from inventory by using its <B>objectID</B> and updates database
	 * @param process : String Identifier of process triggering this action
     * @param objectId : int Item Instance identifier of the item to be destroyed
     * @param count : int Quantity of items to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItem(String process, int objectId, int count, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance item = getItemByObjectId(objectId);
		if (item == null) return null;

		// Adjust item quantity
		if (item.getCount() > count)
		{
            synchronized(item)
            {
    			item.changeCount(process, -count, actor, reference);
    			item.setLastChange(L2ItemInstance.MODIFIED);

    			item.updateDatabase();
    			refreshWeight();
                }
			return item;
		}
		// Directly drop entire item
		else return destroyItem(process, item, actor, reference);
	}

	/**
	 * Destroy item from inventory by using its <B>itemId</B> and updates database
	 * @param process : String Identifier of process triggering this action
     * @param itemId : int Item identifier of the item to be destroyed
     * @param count : int Quantity of items to be destroyed
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
     * @return L2ItemInstance corresponding to the destroyed item or the updated item in inventory
	 */
	public L2ItemInstance destroyItemByItemId(String process, int itemId, int count, L2PcInstance actor, L2Object reference)
	{
		L2ItemInstance item = getItemByItemId(itemId);
		if (item == null) return null;

        synchronized(item)
        {
            // Adjust item quantity
    		if (item.getCount() > count)
    		{
    			item.changeCount(process, -count, actor, reference);
    			item.setLastChange(L2ItemInstance.MODIFIED);
    		}
    		// Directly drop entire item
    		else return destroyItem(process, item, actor, reference);

    		item.updateDatabase();
    		refreshWeight();
        }
		return item;
	}

	/**
	 * Destroy all items from inventory and updates database
	 * @param process : String Identifier of process triggering this action
	 * @param actor : L2PcInstance Player requesting the item destroy
	 * @param reference : L2Object Object referencing current action like NPC selling item or previous item in transformation
	 */
	public synchronized void destroyAllItems(String process, L2PcInstance actor, L2Object reference)
	{
		for (L2ItemInstance item : _items)
			destroyItem(process, item, actor, reference);
	}

	/**
	 * Get warehouse adena
	 */
	public int getAdena()
    {
        int count = 0;

        for (L2ItemInstance item : _items)
            if (item.getItemId() == 57)
            {
                count = item.getCount();
                return count;
            }

        return count;
    }

    /**
     * Adds item to inventory for further adjustments.
     * @param item : L2ItemInstance to be added from inventory
     */
    protected void addItem(L2ItemInstance item)
    {
        _items.add(item);
    }

    /**
     * Removes item from inventory for further adjustments.
     * @param item : L2ItemInstance to be removed from inventory
     */
    protected void removeItem(L2ItemInstance item)
    {
        _items.remove(item);
    }

	/**
	 * Refresh the weight of equipment loaded
	 */
    protected void refreshWeight() {}

	/**
	 * Delete item object from world
	 */
	public void deleteMe()
	{
		try { updateDatabase(); } catch (Throwable t) {_log.log(Level.SEVERE, "deletedMe()", t); }
		List<L2Object> items = new FastList<L2Object>(_items);
    	_items.clear();

    	L2World.getInstance().removeObjects(items);
	}

	/**
	 * Update database with items in inventory
	 */
	public void updateDatabase()
	{
		if (getOwner() != null)
		{
		    for (L2ItemInstance item : _items)
		    {
		    	if (item != null)
		    		item.updateDatabase();
		    }
		}
	}

    /**
	 * Get back items in container from database
	 */
    public void restore()
    {
        java.sql.Connection con = null;
        try
        {
            con = L2DatabaseFactory.getInstance().getConnection();
            PreparedStatement statement = con.prepareStatement(
					"SELECT object_id FROM items WHERE owner_id=? AND (loc=?) " +
					"ORDER BY object_id DESC");
            statement.setInt(1, getOwnerId());
            statement.setString(2, getBaseLocation().name());
            ResultSet inv = statement.executeQuery();

            L2ItemInstance item;
            while (inv.next())
            {
				int objectId = inv.getInt(1);
				item = L2ItemInstance.restoreFromDb(objectId);
				if (item == null) continue;

				L2World.getInstance().storeObject(item);

				// If stackable item is found in inventory just add to current quantity
				if (item.isStackable() && getItemByItemId(item.getItemId()) != null)
					addItem("Restore", item, null, getOwner());
				else addItem(item);
            }

            inv.close();
            statement.close();
            refreshWeight();
        }
        catch (Exception e)
        {
			_log.log(Level.WARNING, "could not restore container:", e);
        }
        finally
        {
            try { con.close(); } catch (Exception e) {}
        }
    }

    public boolean validateCapacity(int slots) { return true; }

    public boolean validateWeight(int weight) { return true; }

}
